JP6522377B2 - Grinding coolant supply device, grinding equipment, grinding method - Google Patents

Description

  The present invention is a grinding coolant that generates and supplies a grinding coolant using modified water when grinding elements of machine parts having rolling elements such as rolling bearings, constant velocity joints, ball screws, rolling linear motion bearings, etc. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeding device and a grinding facility and a grinding method thereof.

  In the grinding process, high temperature is generated by the contact between the workpiece and the grindstone, and the workpiece and the grindstone are thermally damaged. Therefore, the heat is usually dissipated by the coolant. The ability required for the coolant is required to have lubricity to reduce the grinding resistance and to suppress the generation of heat, and to have a cooling property to take heat from the workpiece and the grindstone. There are three major types of coolants, which are soluble (water soluble), oil based and emulsion systems in between.

  Soluble systems are excellent in cooling performance but poor in lubricity. In addition, although oil based systems are excellent in lubricity, they are inferior in cooling performance. Emulsion systems have intermediate performance. Select a soluble system for thermally affected workpieces and workpieces that require quality accuracy, and select an oil-based system for workpieces that require a short processing time. At present, there is no coolant that has a high degree of lubricity and cooling.

  In addition, although it is not for grinding, as a coolant which cuts, the method of diluting with reforming water is proposed (for example, patent document 1).

JP, 2011-174064, A

The conventional grinding coolant can not effectively remove the heat generated at the time of grinding, and it is impossible to improve the sharpness of the grinding wheel, shorten the processing time, prolong the grinding wheel life, and improve the processing accuracy. It is difficult to plan.
Although it is an oil-based coolant as a coolant for cutting, the method of producing using reforming water is proposed by patent documents 1 grade. However, the properties required for the coolant are different between cutting and grinding, and normally, the cutting coolant can not be used for grinding as it is.
That is, in cutting, a single blade is always in contact with the workpiece, and lubricity at the time of processing and viscosity that does not cause coolant breakage are required. Therefore, an important characteristic required of the cutting coolant is lubricity.

On the other hand, in the grinding process, since the grindstone is always rotated with a new cutting tool with an infinite number of cutting edges by abrasive grains and a self-generating action, lubricity and viscosity are not required so much. On the other hand, while the surface roughness accuracy required for the machined surface is required to be cut for Ra 0.5 μm or more, in the case of grinding, mechanical components using rolling elements are required to have an accuracy of Ra 0.4 μm or less. Since machining involves heat generation more than cutting, machining accuracy can not be satisfied unless thermal expansion is suppressed. Therefore, the important characteristic required for the grinding coolant is the cooling property. The cutting coolant can not be used as it is for the grinding coolant because the performances required for the cutting and the grinding are different as described above.
The coolant of Patent Document 1 has insufficient cooling when used for grinding.

  The object of the present invention is to effectively remove the heat generated at the time of grinding, and improve the sharpness of the grinding wheel, shorten the processing time, extend the life of the grinding wheel, and improve the machining accuracy. Supplying equipment · Grinding equipment · Grinding method.

The grinding coolant supply device according to the present invention is a device for supplying a grinding coolant to a grinding machine for grinding an element of a machine part having rolling elements,
A water-soluble coolant stock solution, a first modified water having an average particle diameter of 80 nm or more and 150 nm or less, and a grinding coolant which is a mixed water having an average particle diameter of 5 nm or more and less than 80 nm A grinding coolant generating device and grinding coolant feeding means for feeding the generated grinding coolant to the grinding machine.

In addition, the said "particle diameter" in modified water means the diameter calculated | required by a dynamic light confusion method with a particle diameter.
The above-mentioned "mechanical component having rolling elements" refers to a component having rolling elements which are rolling contact elements such as rolling bearings, constant velocity joints, ball screws, rolling and linear bearings. The "element of machine part" refers to a component such as a bearing ring that constitutes the machine part. The portion to be ground is, for example, a rolling contact surface with which the rolling element contacts, but may be another surface.

According to this configuration, since the first modified water has an average particle diameter of 80 to 150 nm, the permeability to the processing point is high, and the cooling effect can be easily obtained. The second modified water has a finer particle size than the first modified water, having an average particle size of 5 nm or more and less than 80 nm, so the permeability to the processing point is high and it is easy to evaporate. The heat removal effect is greater than the first reforming water. In addition, since the kinetic energy is higher than that of the first reformed water and the Brownian movement is intense, the permeability to the processing point is higher than that of the first reformed water. Although the first modified water has lower permeability than the second modified water, it has excellent lubricity for reducing the grinding resistance and suppressing the generation of heat.
By cooling with the grinding coolant containing the first and second reforming water of such nature, it is possible to effectively remove the heat generated at the time of grinding. As a result, the sharpness of the grindstone is improved, and the processing time can be shortened, the life of the grindstone can be extended, and the processing accuracy can be improved.
In addition, even if it uses the reforming water which has an intermediate particle diameter of the 1st reforming water and the 2nd reforming water, although the cooling property which was excellent to some extent is obtained, the 1st reforming which is excellent in lubricity By coexistence of water and the second reformed water which is more excellent in permeability and excellent in cooling property, both the cooling property and the lubricating property are more excellent.
The second reforming water (K3) has a higher redox potential than the first reforming water (K1), and rusting occurs when the concentration is high. Conversely, the first reforming water (K1) has a lower redox potential than tap water, and rust is less likely to occur. Therefore, it is necessary to operate at a blending ratio in consideration of particle diameter, browning motion, rusting property, and the like. The first reforming water (K1) is, although speaking only fine, it is characterized by a particle diameter that easily penetrates, and a property that the undiluted coolant solution tends to diffuse. The second modified water (K3) is, of course, smaller in particle size and easier to penetrate, but is fine and therefore has a large Brownian motion, and has a role of giving kinetic energy to the entire coolant. The source of this kinetic energy is the redox potential. However, if the redox potential is high, it causes rusting, so it is necessary to have a distribution that maintains the balance between the action of kinetic energy to the first reforming water (K1) and the rusting.

Another grinding coolant supply device according to the present invention is a device for supplying a grinding coolant to a grinding machine for grinding an element of a machine part having rolling elements,
A mixing means for mixing a plurality of types of water to obtain a grinding coolant, a coolant stock solution feeding means for supplying a water-soluble coolant stock solution to the mixing means, and a first reforming in which the particle diameter of water particles is 80 to 150 nm. A first reforming water supply means for supplying water to the mixing means; and a second reforming water for further reducing the particle diameter of the first reforming water to be supplied to the mixing means And a reforming water supply means.

  In the case of this configuration, similarly to the above, a grinding coolant is used which is a mixed water of the undiluted coolant solution, the first modified water having a particle diameter of 80 to 150 nm, and the second modified water having a further reduced particle diameter. Since the grinding is performed, the heat generated during the grinding can be effectively removed. As a result, the sharpness of the grindstone is improved, and the processing time can be shortened, the life of the grindstone can be extended, and the processing accuracy can be improved.

Still another grinding coolant supply device according to the present invention is a device for supplying a grinding coolant to a grinding machine for grinding an element of a machine part having rolling elements,
A mixing means for mixing a plurality of types of water to obtain a grinding coolant, a coolant stock solution supplying means for supplying a water-soluble coolant stock solution to the mixing means, and a first one for supplying a first reforming water to the mixing means A reforming water supply means, and a second reforming water supply means for supplying a second reforming water to the mixing means,
The first reforming water supply means contains chemical components of SIO2: 73 to 77%, Al2O3: 13 to 15%, CaO: 1 to 2%, MnO: 0.65 to 0.77%, and others 7.3. A primary filter filled with porous ore of ~ 9%, a secondary filter filled with ceramic balls generated from the porous ore of the chemical component, and these primary filter and secondary filter in order And water feeding means for passing water;
The second modified water supply means includes a filter filled with ceramic balls supporting nano silver, which is produced from the porous ore of the chemical component, and a water feed means for passing water through the filter. It is characterized by In addition,% of the said chemical component is weight%.

The ore is a porous natural ceramic, and by passing water under pressure, water particles are refined to the nano level, the interfacial tension is reduced, and the permeability is improved. In the case of providing the first and second reforming water supply means using a filter of such packing, a mixed water of the first reforming water and the second reforming water having the same particle diameter as above. Since the grinding coolant is used for grinding, it is possible to effectively remove the heat generated at the time of grinding. As a result, the sharpness of the grindstone is improved, and the processing time can be shortened, the life of the grindstone can be extended, and the processing accuracy can be improved.
The above "nano silver" refers to silver having a particle diameter of about 10 nm, for example, about 1 to 20 nm. The above "ceramic balls" are roughly classified into unglazed bodies and sintered bodies. The unglazed body is a powder of fireproof stone made into a spherical shape of about 7 to 10 mm and sintered at a temperature of about 1000 ° C. to 1500 ° C. The fired body is a powder containing fireproof stone powder on the surface of the sintered body. A glaze is applied and fired at a temperature of about 1000 ° C. to about 1500 ° C.

In the grinding coolant supply device according to any one of the above-described configurations of the present invention, the grinding coolant includes the coolant stock solution: 2 to 5%, the first reforming water: 85 to 93%, and the second reforming water: It may be 5 to 10%. In addition,% of the said ratio is volume%.
It was confirmed by tests that cooling can be performed most effectively at the time of grinding when the ratio of the coolant stock solution, the first reforming water, and the second reforming water is the above ratio.

A grinding facility according to the present invention includes the grinding coolant supply device according to any one of the above-described configurations according to the present invention, and the grinding machine.
According to the grinding equipment of this configuration, the heat generated at the time of grinding can be effectively removed since the grinding coolant supply device of the present invention is used. As a result, the sharpness of the grindstone is improved, and the processing time can be shortened, the life of the grindstone can be extended, and the processing accuracy can be improved.

The grinding method according to the present invention is a grinding method for grinding an element of a machine part having rolling elements, and is a first modification in which the water-soluble coolant stock solution and the average particle diameter of water particles are 80 nm or more and 150 nm or less. This is a method of producing a grinding coolant which is a mixed water of water and a second modified water having an average particle diameter of water particles of 5 nm or more and less than 80 nm, and grinding processing using the produced grinding coolant.
According to this grinding method, since the grinding coolant in which the first reforming water and the second reforming water having the particle diameter in the above-mentioned range are mixed is used, the heat generated at the time of grinding can be effectively removed. As a result, the sharpness of the grindstone is improved, and the processing time can be shortened, the life of the grindstone can be extended, and the processing accuracy can be improved.
The second reforming water may be water obtained by further reforming the first reforming water into smaller water particles.

  Since the grinding coolant supply device, grinding equipment, and grinding method of the present invention use the grinding coolant in which the first reforming water and the second reforming water having particle diameters in the above range are mixed, the heat generated during grinding is effective. Can be removed. As a result, the sharpness of the grindstone is improved, and the processing time can be shortened, the life of the grindstone can be extended, and the processing accuracy can be improved.

It is a schematic diagram which shows the grinding coolant supply apparatus and grinding equipment which concern on the 1st Embodiment of this invention. It is a sectional view of a conceptual composition of the 1st modification water supply means in the grinding coolant supply device. It is sectional drawing of the conceptual structure of the 2nd reforming water supply means in the grinding coolant supply device. It is explanatory drawing which shows the image of the water of each process in the grinding coolant supply apparatus. It is explanatory drawing of an example of a grinder. It is a schematic diagram which shows the grinding coolant supply apparatus and grinding equipment which concern on other embodiment of this invention. It is the graph which compared the effect of the grinding coolant (reforming water) obtained with the grinding coolant supply device of an embodiment, and the liquid used as other coolant by processing accuracy.

  A first embodiment of the present invention will be described in conjunction with FIGS. This grinding coolant supply device is a device for supplying the grinding coolant to the grinding machine 1, which is a mixing means 2 for mixing a plurality of types of water to make the grinding coolant, a coolant undiluted solution supplying means 3, and a first reforming. A water supply means 4, a second reforming water supply means 5, and a grinding coolant feed means 6 are provided. The mixing means 2, the undiluted solution supply means 3, the first reforming water supply means 4 and the second reforming water supply means 4 constitute a grinding coolant generator 7. The number of grinding machines 1 to which the grinding coolant is supplied from the grinding coolant supply device may be one or plural.

  The grinding machine 1 is a grinding machine for grinding elements of machine parts having rolling elements. The mechanical component having the rolling element is, for example, a rolling bearing, a constant velocity joint, a ball screw, a rolling linear motion bearing, or the like. The element of the machine part refers to a component that constitutes the machine part, and in the case of a rolling bearing, for example, a bearing ring such as an inner ring or an outer ring thereof.

  FIG. 5 shows an example of the grinding machine 1. The grinding machine 1 is an apparatus for grinding an inner diameter surface of a rolling bearing as a workpiece W, which is an element of a machine component, and supporting the workpiece W, which is a grinding workpiece, with a shoe 21, a backing plate The workpiece W is rotated about its center O by the workpiece driving motor 23 via 22. The inner diameter surface, which becomes the raceway surface of the workpiece W, is ground by the rotary grindstone 24 while rotating the workpiece W. The rotary grindstone 24 is rotated by the grindstone drive motor 25. The grinding wheel drive motor 25 is moved by the grinding wheel moving mechanism 26 in the horizontal orthogonal two axial directions. The workpiece drive motor 23 is installed on the base 28. The grinding coolant is discharged from the coolant nozzle 27 in the vicinity of the contact surface with the workpiece W in the rotary grindstone 24. The grinding coolant is supplied from the grinding coolant supply device of FIG.

In FIG. 1, the mixing means 2 is comprised by the coolant tank 2a. A stirring device (not shown) may be provided in the coolant tank 2a or in the front stage of the coolant tank 2a.
The grinding coolant feeding means 6 is composed of a pipe 6 a for feeding grinding coolant in a coolant tank 2 a such as tap water to the grinding machine 1 and a pump 6 b.
The coolant undiluted solution supply means 3 comprises a tank 3a for storing a coolant undiluted solution such as tap water, and a pipe 3b and a pump 3c for sending the undiluted solution in the tank 3a to the coolant tank 2a.

The first reforming water supply means 4 includes a first water producing unit 4a for producing a first reforming water, a pipe 4b for feeding the first reforming water produced to the coolant tank 2a, and It comprises the pump 4c. Water as a raw material to the first water maker 4 a is supplied from the water supply 8.
The second reforming water supply means 4 includes a second water producing unit 4a for producing a second reforming water, a pipe 4b for sending the second reforming water produced to the second tank to the coolant tank 2a, and It comprises the pump 4c. Water as a raw material to the second water maker 4 a is supplied from the first reforming water supply means 4.

  The first reforming water may be called K1 reforming water, and is abbreviated as “K1 water” in the figure. The second reforming water may be called K3 reforming water, and is abbreviated as "K3 water" in the figure. K1 reformed water and K3 reformed water are names designated by specific standards. According to the standard, reformed water is classified into three types of K1, K2, and K3 according to components and constitution as shown in Table 1 below, but in the grinding coolant supply device of this embodiment, K2 reformed water is used Then, K3 reformed water is used as the second reformed water. The particle sizes of the first and second modified waters may be different from those of the K1 and K3 modified waters of Table 1.

  As the conceptual configuration is shown in FIG. 2, the first fresh water generator 4 a in the first reformed water supply means 4 is a primary filter 11 and a secondary filter 12 filled in metal containers 10 A and 10 B, respectively. Are arranged in series via an intermediate path 10C such as a pipe, and the water before reforming is pressure-passed by the pump 13 in the filters 11 and 12. The primary filter 11 is a filter filled with a porous ore raw stone of a predetermined chemical component. The secondary filter is a filter filled with ceramic balls produced from the ore. The above-mentioned "ceramic balls" are roughly classified into a sintered body and a sintered body. The unglazed body is a powder of fireproof stone made into a spherical shape of about 7 to 10 mm and sintered at a temperature of about 1000 ° C. to 1500 ° C. The fired body is a powder containing fireproof stone powder on the surface of the sintered body A glaze is applied and fired at a temperature of about 1000 ° C. to about 1500 ° C.

  As the conceptual configuration is shown in FIG. 3, the second water maker 5a in the second reforming water supply means 5 arranges the filter 15 in the metal container 14, in which the water before reforming is The pump 16 is configured to pass pressure. The filter 15 is made of porous ore of the predetermined chemical component and is filled with a ceramic ball supporting nano silver. The ceramic ball is the same as the ceramic ball used for the first modified water supply means 4 except that it carries nano silver. The above-mentioned "nano silver" refers to silver having a particle diameter of about 10 nm, for example, about 1 to 20 nm.

As the ore of the predetermined chemical component, for example, an anti-glare such as Amagi anti-glare is used. Anti-pite is a type of rhyolite produced in Izu Peninsula, etc. After obsidian is burned at ultra-high temperature by volcanic eruptive activity, it is quenched and pumice with fine pores by the expulsion of water vapor and gas. It has become. Its chemical composition is the a predetermined chemical _{components, SIO 2: 73~77%, Al} 2 O 3: 13~15%, CaO: 1~2%, MnO: 0.65~0.77%, other 7.3 to 9%. The Amagi fireproof stone is said to be calculated at Amagiyama among fireproof stones.
In addition, the ore used for each said filter 11, 12, 15 should just be a porous ore provided with the said chemical component not only in a fireproof.

To explain the influence of the fillings of the primary and secondary filters 11 and 12 on water in the first water cooler 4a, the hydrogen bonding of water by infrared rays (4 to 14 μm) emitted from the fireproof stone As shown in FIG. 4, the tap water of about 200 nm before modification (FIG. 4A) is about 100 nm, for example, 80 to 150 nm or less of water molecules (fine water molecules) and (FIG. 4 (B)). The specific gravity of the water particle is 1 or more, the gas is released, and the six-ring bond is stabilized. Here, the term "water particles" refers to a population of water molecules (H 2 ₀₎ has become a particulate gathered.

In the second water maker 5a, to explain the influence of the filling of the filter 16 on water, the first reforming water (K1 reforming water) is allowed to pass through the second water making machine 5a. The water particles are further refined to about 10 nm, for example, about 5 to less than 80 nm, and the kinetic energy is increased by the quantum sieving effect, and the brown motion of water is activated (FIG. 4 (C)).
Such respective reforming water and the coolant stock solution are mixed to form a grinding coolant as shown in FIG. 4 (D).

The respective reforming waters will be described.
<First reformed water (K1 reformed water)>
-Characteristics Since the particle diameter is 80 to 150 nm, the permeability to the processing point is high, and the cooling effect can be easily obtained. In addition, the six-membered ring bond is stable, and it is difficult for impurities and gases to penetrate. In addition, since the undiluted solution of coolant is taken into the six-membered ring, the undiluted solution of water and undiluted solution of coolant hardly separates and becomes stable.
The average particle size of the first modified water is preferably about 100 nm, for example, 90 to 110 nm.
-Specific method Specific gravity 1 or more. Microscopic observation of 6-membered ring bond. There is little movement of water molecules.
<Second reformed water (K3 reformed water)>
-Characteristics Since the particle diameter is 5 to 80 nm and ultrafine particles, the permeability to the processing point is high, and the effect of evaporating easily and taking heat is larger than that of the first modified water. In addition, since the kinetic energy is higher than that of the first reformed water and the Brownian movement is intense, the permeability to the processing point is higher than that of the first reformed water.
-Specific method Specific gravity 1 or more. Microscopic observation of 6-membered ring bond. There is a lot of movement of water molecules.
The average particle diameter of the second modified water is preferably about 10 nm, for example, 9 to 11 nm.
Further, the first reforming water and the second reforming water may use reforming water having different zeta potentials.

According to the grinding coolant supply device of this configuration, since the first modified water has a particle diameter of 10 to 150 nm, the permeability to the processing point is high, and the cooling effect can be easily obtained. The second modified water has a particle size of 5 to less than 80 nm and is finer than the first modified water, so the permeability to the processing point is high and it is easy to evaporate. The depriving effect is greater than the first reformed water. In addition, since the kinetic energy is higher than that of the first reformed water and the Brownian movement is intense, the permeability to the processing point is higher than that of the first reformed water. Although the first modified water has lower permeability than the second modified water, it has excellent lubricity for reducing the grinding resistance and suppressing the generation of heat.
By cooling with the grinding coolant containing the first and second reforming water of such nature, it is possible to effectively remove the heat generated at the time of grinding. As a result, the sharpness of the grindstone is improved, and the processing time can be shortened, the life of the grindstone can be extended, and the processing accuracy can be improved.
In addition, even if it uses the reforming water which has an intermediate particle diameter of the 1st reforming water and the 2nd reforming water, although the cooling property which was excellent to some extent is obtained, the 1st reforming which is excellent in lubricity By coexistence of water and the second reforming water which is more excellent in permeability and excellent in cooling property, both the cooling property and the lubricity are more excellent.
Further, as described above, the second reforming water (K3) has a higher redox potential than the first reforming water (K1), and rusting occurs when the concentration is high. Conversely, the first reforming water (K1) has a lower redox potential than tap water, and rust is less likely to occur. Therefore, it is necessary to operate at a blending ratio in consideration of particle diameter, browning motion, rusting property, and the like.

FIG. 7 shows dimensional changes in the case where 200 pieces of each are constructed in a non-dressing manner using a water-soluble coolant, tap water, an oil-based coolant, and a grinding coolant which is reforming water obtained by the grinding coolant supply device of this embodiment. Show the transition of
As shown in the figure, according to the grinding coolant using the reforming water by the grinding coolant supply device of this embodiment, when any of the water-soluble coolant, the tap water and the oil-based coolant is used even if the number of machining increases It can be seen that the dimensional change is smaller than that. From this, it is considered that when the grinding coolant using the above-mentioned reformed water is used, the falling off of the grindstone is small and the sharpness continues.

  FIG. 7 shows another embodiment of the present invention. This embodiment is configured by adding the recovery means 9 and the reformed water regenerating means 10 in the first embodiment. The recovery means 9 is a means for recovering the grinding coolant used for grinding processing by the grinder 1 and returning it to the coolant tank 2a of the mixing means 2, and is constituted by piping and a pump (not shown). The reforming water regenerating means 10 is a means for circulating and regenerating the grinding coolant in the coolant tank 2a of the mixing means 2, and includes the reforming water regenerator 10a, the reforming water regenerator 10a, and the coolant tank 2a. Between the pipe 10b for circulating the grinding coolant and the pump 10c.

  The reformed water regenerator 10a is a means for returning the grinding coolant in the coolant tank 2a including the collected grinding coolant to the same state as the grinding coolant in the state generated by the second water heater 5a, for example, The secondary filter 12 (see FIG. 2) in the first fresh water generator 5a and the filter 14 in the second fresh water generator 5a (see FIG. 3) are arranged in parallel, and the coolant tank 2a (FIG. 6) And the pump coolant (not shown) is pumped and let through.

  Thus, when the reforming water regenerating means 10 is provided, the particle diameter of the original grinding coolant to be supplied to the grinding machine 1 can be recovered even when the grinding coolant used in the grinding process is collected and reused by the grinding machine 1 It can be maintained in a state of having

  As mentioned above, although the form for implementing this invention was demonstrated based on embodiment, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is indicated not by the above description but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

DESCRIPTION OF SYMBOLS 1 ... Grinding machine 2 ... Mixing means 2a ... Coolant tank 3 ... Coolant undiluted | stock solution supply means 4 ... 1st reforming water supply means 4a ... 1st water maker 5 ... 2nd reforming water supply means 5a ... 2nd Water-making device 6 ... Grinding coolant feeding means 7 ... Grinding coolant generation device 10 ... Reformed water regenerating means 10a ... Reformed water regenerator 11 ... Primary filter 12 ... Secondary filter 15 ... Filter

Claims (6)

An apparatus for supplying a grinding coolant to a grinding machine for grinding an element of a machine part having rolling elements, comprising:
A mixture of a water-soluble coolant stock solution, a first modified water having an average particle diameter of 80 nm or more and 150 nm or less, and a second modified water having an average particle diameter of 5 nm or more and less than 80 nm A grinding coolant supply device comprising: a grinding coolant generation device for generating a grinding coolant which is water; and grinding coolant feeding means for grinding the generated grinding coolant to the grinding machine. An apparatus for supplying a grinding coolant to a grinding machine for grinding an element of a machine part having rolling elements, comprising:
A mixing means for mixing a plurality of types of water to form a grinding coolant, a coolant stock solution feeding means for supplying a water-soluble coolant stock solution to the mixing means, and a first water particle having an average particle diameter of 80 nm or more and 150 nm or less A first reforming water supply means for supplying the reforming water to the mixing means, and a second reforming water obtained by further reforming the first reforming water to a smaller particle diameter is supplied to the mixing means A grinding coolant supply device comprising a second reforming water supply means. An apparatus for supplying a grinding coolant to a grinding machine for grinding an element of a machine part having rolling elements, comprising:
A mixing means for mixing a plurality of types of water to obtain a grinding coolant, a coolant stock solution supplying means for supplying a water-soluble coolant stock solution to the mixing means, and a first one for supplying a first reforming water to the mixing means A reforming water supply means, and a second reforming water supply means for supplying a second reforming water to the mixing means,
The first reforming water supply means contains chemical components of SIO2: 73 to 77%, Al2O3: 13 to 15%, CaO: 1 to 2%, MnO: 0.65 to 0.77%, and others 7.3. A primary filter filled with porous ore of ~ 9%, a secondary filter filled with ceramic balls generated from the porous ore of the chemical component, and these primary filter and secondary filter in order And water feeding means for passing water;
The second modified water supply means includes a filter filled with ceramic balls supporting nano silver, which is produced from the porous ore of the chemical component, and a water feed means for passing water through the filter.
Grinding coolant supply device characterized in that.   The grinding coolant supply device according to any one of claims 1 to 3, wherein the grinding coolant comprises the coolant raw solution: 2 to 5%, the first reforming water: 85 to 93%, the second Reforming water: Grinding coolant supply device that is 5 to 10%.   The grinding installation provided with the grinding coolant supply apparatus of any one of Claim 1 thru | or 4, and the said grinder. A grinding method for grinding an element of a machine part having rolling elements, comprising:
Mixed water of a water-soluble coolant stock solution, a first modified water having an average particle diameter of 80 nm or more and 150 nm or less, and a second modified water having an average particle diameter of 5 nm or more and less than 80 nm A grinding method of a machine part which generates a grinding coolant and grinds using the generated grinding coolant.

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